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Significant Accounting Policies - Acquired Unfavorable Real Estate Leases and Amortization (Details) - Acquired unfavorable real estate leases - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Acquired Unfavorable Real Estate Leases and Amortization
Amortization	$ 500	$ 900	$ 1,300
Estimated annual amortization for succeeding five years
2022	161
2023	104
2024	93
2025	60
2026	31
2027 and thereafter	$ 79
Minimum
Acquired Unfavorable Real Estate Leases and Amortization
Term of lease	64 months
Maximum
Acquired Unfavorable Real Estate Leases and Amortization
Term of lease	151 months

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Amount of amortization of acquired leases acquired as part of a real property acquisition at below market lease rate with a finite life.

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Amount of amortization income for lease with finite life acquired as part of real property acquisition at below market lease rate expected to be recognized in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization income for lease with finite life acquired as part of real property acquisition at below market lease rate expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization income for lease with finite life acquired as part of real property acquisition at below market lease rate expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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